Theorem 3.1 [1]}
Let \(f:\mathbb {R}^n\rightarrow \mathbb {R}\)  is an \(L\) -smooth convex function for some \(L>0\) . If \(t_k=\tfrac{1}{\ell _{\max }}\)  for all \(k\) , then, for \(k=n,2n,3n,\ldots \) ,
\(\left( f(x^{k}) \right)-f^\star \le \left(\frac{4n R_0^2\ell _{\max }(1+nL^2/\ell ^2_{\max })}{k+8}\right),\) 
